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r Ms. Mary Ways Page 4 May 24, 1994 prior to shipment to the laboratory. The completed COC form will list all the samples contained in the cooler and will specify what analytical parameters are requested for each sample. BoringGGrouting_ Upon completion of soil sampling, the borings will be grouted using a mix of approximately 1 sack (94 pounds) Portland cement, approximately 5 pounds powdered bentonite and approximately 8 gallons water. The bentonite powder and water will be mixed prior to the addition of cement. Storage of Cuttings., Upon completion of the drilling and sampling activity, all cuttings will be collected and stored on site, in labeled drums or other appropriate containers'. Also, any fluids from the borings displaced by the placement of the grout or from the evacuation process will be collected in labeled drums or appropriate containers. Decontamination Procedures. Sampling equipment (i.e., continuous soil sampler, liners) will be decontaminated between individual sampling points to minimize potential cross-contamination. Drilling equipment (i.e., augers, drill stems, drill bits, other downhole equipment) will be decontaminated between borings to minimize cross-contamination. The drill rig will be decontaminated between each boring location if ground water is encountered, or if the working end of the rig is visibly soiled. Analytical Methodologies Each soil sample will be analyzed for TPH (Gasoline) by EPA Method 8015 Modified and benzene, toluene, ethyl benzene, and xylene by EPA Method 8020. In addition, one soil sample will be collected from each tank site and submitted for analyses for pH, Total Organic Carbon, and biologic plate count. All analyses will be performed by a California-certified laboratory according to the published EPA approved procedures, including adherence to specified holding times. Proposed Schedule and Closing ERM-West expects that the field activities described in this workplan can be completed within one to two days and can be scheduled within the month of June 1994, pending receipt of PHS/EHD approval. Assuming a standard turn around time for laboratory analyses of two weeks, a letter report presenting the results of the additional characterization can be submitted to PHS/EHD by August 1994.